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Verizon users might want to start looking for another provider. In an effort to better serve advertisers, Verizon Wireless has been silently modifying its users' web traffic on its network to inject a cookie-like tracker. This tracker, included in an HTTP header called X-UIDH, is sent to every unencrypted website a Verizon customer visits from a mobile device. It allows third-party advertisers and websites to assemble a deep, permanent profile of visitors' web browsing habits without their consent.Verizon apparently created this mechanism to expand their advertising programs, but it has privacy implications far beyond those programs. Indeed, while we're concerned about Verizon's own use of the header, we're even more worried about what it allows others to find out about Verizon users. The X-UIDH header effectively reinvents the cookie, but does so in a way that is shockingly insecure and dangerous to your privacy. Worse still, Verizon doesn't let users turn off this "feature." In fact, it functions even if you use a private browsing mode or clear your cookies. You can test whether the header is injected in your traffic by visiting lessonslearned.org/sniff or amibeingtracked.com over a cell data connection.How X-UIDH Works, and Why It's a Problem

To compound the problem, the header also affects more than just web browsers. Mobile apps that send HTTP requests will also have the header inserted. This means that users' behavior in apps can be correlated with their behavior on the web, which would be difficult or impossible without the header. Verizon describes this as a key benefit of using their system. But Verizon bypasses the 'Limit Ad Tracking' settings in iOS and Android that are specifically intended to limit abuse of unique identifiers by mobile apps.

Because the header is injected at the network level, Verizon can add it to anyone using their towers, even those who aren't Verizon customers.

For most of the past six weeks, the biggest story out of Silicon Valley was Apple’s battle with the FBI over a federal order to unlock the iPhone of a mass shooter. The company’s refusal touched off a searing debate over privacy and security in the digital age. But this morning, at a small office in Mountain View, California, three guys made the scope of that enormous debate look kinda small. Mountain View is home to WhatsApp, an online messaging service now owned by tech giant Facebook, that has grown into one of the world’s most important applications. More than a billion people trade messages, make phone calls, send photos, and swap videos using the service. This means that only Facebook itself runs a larger self-contained communications network. And today, the enigmatic founders of WhatsApp, Brian Acton and Jan Koum, together with a high-minded coder and cryptographer who goes by the pseudonym Moxie Marlinspike, revealed that the company has added end-to-end encryption to every form of communication on its service.

This means that if any group of people uses the latest version of WhatsApp—whether that group spans two people or ten—the service will encrypt all messages, phone calls, photos, and videos moving among them. And that’s true on any phone that runs the app, from iPhones to Android phones to Windows phones to old school Nokia flip phones. With end-to-end encryption in place, not even WhatsApp’s employees can read the data that’s sent across its network. In other words, WhatsApp has no way of complying with a court order demanding access to the content of any message, phone call, photo, or video traveling through its service. Like Apple, WhatsApp is, in practice, stonewalling the federal government, but it’s doing so on a larger front—one that spans roughly a billion devices.

The FBI and the Justice Department declined to comment for this story. But many inside the government and out are sure to take issue with the company’s move. In late 2014, WhatsApp encrypted a portion of its network. In the months since, its service has apparently been used to facilitate criminal acts, including the terrorist attacks on Paris last year. According to The New York Times, as recently as this month, the Justice Department was considering a court case against the company after a wiretap order (still under seal) ran into WhatsApp’s end-to-end encryption. “The government doesn’t want to stop encryption,” says Joseph DeMarco, a former federal prosecutor who specializes in cybercrime and has represented various law enforcement agencies backing the Justice Department and the FBI in their battle with Apple. “But the question is: what do you do when a company creates an encryption system that makes it impossible for court-authorized search warrants to be executed? What is the reasonable level of assistance you should ask from that company?”